Palladium-Catalyzed Sequential C(<i>sp</i>
<sup>2</sup>
)-H Alkynylation/Annulation of 2-Phenylphenols with Haloalkynes Using Phenolic Hydroxyl as the Traceless Directing Group
An efficient, palladium(II)‐catalyzed, C(sp2)‐H alkynylation/annulation of 2‐phenylphenols with haloalkynes for the synthesis of substituted 6‐methylene‐6H‐dibenzo[b,d]pyrans is reported. This protocol features a traceless directing group strategy, unique regioselectivity and mild reaction conditions. Significantly, preliminary mechanistic studies suggest that the sequential C(sp2)‐H alkynylation and
Titanium Salan Catalysts for the Asymmetric Epoxidation of Alkenes: Steric and Electronic Factors Governing the Activity and Enantioselectivity
作者:Evgenii P. Talsi、Denis G. Samsonenko、Konstantin P. Bryliakov
DOI:10.1002/chem.201404157
日期:2014.10.27
A newinsight into the highly enantioselective (up to >99.5 % ee) epoxidation of olefins in the presence of chiral titanium(IV) salan complexes is reported. A series of 14 chiral ligands with varying steric and electronic properties have been designed, and it was found that electronic effects modulate the catalytic activity (without affecting the enantioselectivity), whereas the steric properties account
CYCLIC DERIVATIVES AS MODULATORS OF CHEMOKINE RECEPTOR ACTIVITY
申请人:Carter Percy H.
公开号:US20090124668A1
公开(公告)日:2009-05-14
The present application describes modulators of MCP-1 of formula (I):
or pharmaceutically acceptable salt forms thereof, useful for the treatment of rheumatoid arthritis, multiple sclerosis, atherosclerosis and asthma.
Cyclic derivatives as modulators of chemokine receptor activity
申请人:Carter H. Peroy
公开号:US20070032526A1
公开(公告)日:2007-02-08
The present application describes modulators of MCP-1 of formula (I):
or pharmaceutically acceptable salt forms thereof, useful for the treatment of rheumatoid arthritis, multiple sclerosis, atherosclerosis and asthma.
Process for producing aromatic diols and their ester and ether derivatives
申请人:CELANESE CORPORATION
公开号:EP0178929A1
公开(公告)日:1986-04-23
Carboxylate esters of aromatic diols, e.g., the monoacetate aster of hydroquinone, and carboxylate esters of monoalkyl ethers of aromatic diols, e.g, p-methoxyphenyl acetate, are produced by subjecting an aromatic ketone containing a hydroxy, alkoxy or acyloxy radical on the aromatic ring, e.g.4-hydroxyacetophenone, to a Baeyer-Villiger oxidation using peracetic acid as oxidant under conditions such that the reaction mass contains no more than about 0.1 wt.% of sulfuric acid based on the weight of the initially added pure peracetic acid. The carboxylic esters may be hydrolyzed to the aromatic diols, e.g., hydroquinone, or to the monoalkyl ethers of the aromatic diols, e.g. the monomethyl ether of hydroquinone.